MOS MCQ TEST 1

In an experiment it is found that the shear modulus and bulk modulus are equal. The Poisson’s ratio of that material is

• 0.25
• 0.125
• 0.375
• 0.5

A steel rod of length 1m extends by 1mm when subjected to an axial load, in N/mm 2 the stress developed is

• 50
• 100
• 200
• 400

If a uniform bar is supported at one end in a vertical position and is loaded by its own weight, the maximum stress occurs at

• Bottom end
• Supported end
• Centre of bar
• Same everywhere

If all dimensions of a prismatic body hanged vertically is doubled, the vertical deflection due to self-weight increases by

• Remaining same
• Two times
• Eight times
• Four times

If an elastic body is subjected to direct compressive stress Px in the longitudinal direction. If the lateral strains in the other two directions are prevented by applying Py and Pz in those directions then Py or Pz is equal to

• Px/(μ-1)
• μPx
• Px/((μ+1)μ)
• μPx/(μ-1)

When a compound bar is subjected to a load, the strains in the different components of the compound bar are same, the stresses caused in the components will be

• Inversely proportional to their moduli of elasticity
• Directly proportional to their moduli of elasticity
• Independent of their moduli of elasticity
• None of the above

A tapering circular bar of diameter d1 and varying uniformly to diameter d2 at the other end over a length L and Young’s Modulus E, is subjected to an axial pull P. The total elongation is

• 4PE/πL(d1)2
• 4PL/πEd1d2
• 4PE/ πL(d2)2
• 4PLE/ πd1d2

Strain energy stored in a linearly elastic member is

• Area under stress strain curve
• Half of the product of stress and strain
• Half of the product of stress and strain x volume
• Half of the product of stress x volume

Modulus of resilience is defined as

• Resilience at elastic limit
• Resilience at proportionality limit
• Resilience per unit volume at elastic limit
• None of the above

The ratio between the stress produced in a bar by a sudden application of load as compared to stress produced by the gradual application of the same load

• 2
• 2.5
• 3
• 1.5